One horsepower is equivalent to which of the following in BTU per minute?

One horsepower is equivalent to which of the following in BTU per minute?

• A. 42.4 BTU/min
• B. 50 BTU/min
• C. 30 BTU/min
• D. 60 BTU/min

Answer: (A)

Power is how fast work is done, so we convert horsepower to a BTU-per-minute rate by using consistent energy-per-time units. One mechanical horsepower is 550 ft·lb of work each second. Convert to per minute: 550 × 60 = 33,000 ft·lb per minute. Since 1 BTU equals about 778.169 ft·lb, the BTU per minute value is 33,000 ÷ 778.169 ≈ 42.4. So one horsepower is about 42.4 BTU per minute. The other numbers don’t fit because they would require different power values that don’t match the defined conversion.

Power is how fast work is done, so we convert horsepower to a BTU-per-minute rate by using consistent energy-per-time units. One mechanical horsepower is 550 ft·lb of work each second. Convert to per minute: 550 × 60 = 33,000 ft·lb per minute. Since 1 BTU equals about 778.169 ft·lb, the BTU per minute value is 33,000 ÷ 778.169 ≈ 42.4. So one horsepower is about 42.4 BTU per minute. The other numbers don’t fit because they would require different power values that don’t match the defined conversion.